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Here's another short (20 minute) paper that was presented last year at the 2012 C.S. Lewis Colloquium at Taylor University. It is by Brenton Dickieson from the University of Prince Edward Island in Canada. While listening be sure to watch the Prezi presentation (link below).
Download Paper from Brenton
Prezi (Multimedia) Slides from Brenton's Presentation
Visit Brenton's A Pilgrim in Narnia Site